Putting FM translators on the air doesn't do anything to revitalize AM. That's just AM-to-FM migration. Good for stations that were able to cash in on it, now they are FM stations. But the AM band itself would have been more "revitalized' if those stations with the new translators would have been permitted, or even required to shut down their AM transmitters, reducing nighttime AM band congestion for the stations that remain stuck there. Pai's FCC actually rejected a lot of good ideas that would have actually improved things on AM in the process. I'm thinking of the proposals Scott Fybush submitted in particular. There was some good stuff there that was passed over.